Changes to Start a gemini computer use task

added the new gemini-4-carbon enum value to the request property llm

added subschema #4 to the sessionOptions/credentials/items request property oneOf list

added the new optional request property reasoningEffort

added the new optional request property sessionOptions/credentials

added the new optional request property sessionOptions/proxyRoutes

added the new optional request property sessionOptions/webBotAuth

added the new gemini-4-argon enum value to the request property llm

added the new optional request property sessionOptions/enableWebMcp

the llm request property default value changed from gemini-3.7-flash to gemini-3.8-flash

added the new gemini-3.8-flash enum value to the request property llm

the llm request property default value changed from gemini-3.6-flash to gemini-3.7-flash

added the new gemini-3.7-flash enum value to the request property llm

added the new us enum value to the request property sessionOptions/region

the llm request property default value changed from gemini-3-flash-preview to gemini-3.6-flash

added the new gemini-2.5-computer-use-preview-10-2025 enum value to the request property llm

added the new gemini-3.5-flash-lite enum value to the request property llm

added the new gemini-3.6-flash enum value to the request property llm

removed the enum value gemini-2.5-computer-use-preview-10-2025 of the request property llm

added the new gemini-3.5-flash enum value to the request property llm